Unmaskings are, sadly, legal under PATRIOT ACT / MUH FISA, but having a FISA based on an unverified "Dossier" and having foreign spies provide the recordings IS ILLEGAL.

EDIT: Notice how there's no official unmasking request on the date of Flynn's phone call in Dec 2016 (where he was recorded / supposedly unmasked). How did they get the recording then? See foreign spies above.

Unmaskings are, sadly, legal under PATRIOT ACT / MUH FISA, but having a FISA based on an unverified "Dossier" and having foreign spies provide the recordings IS ILLEGAL.